It would help to know all the costs, not just the renovation and roof. But, right off the bat, you do not put $1 for land. You would prorate the land and building as you did when you initially input the amounts.
If initially, the building was $100,000 and the land was 10% of that cost, you would break those amounts out and enter them. The total cost basis is $110,000.
Now assuming that the land and building values did not change percentage-wise, you would enter the same proration. If the property sold for $300,000, then $270k would be for the building and $30k for the land.
